I probably am undercharging with £12. However, as it's not my main job and only a hobby, I don't feel the need to charge more. That and having done some local market research, around my turning club, friends family and random people on the street/market, the general consensus seems to be around £10 for a slimline, but they would stretch to £12 as they value the work that goes into making it.
Phil, yes, each one takes about half hour. I value my time at around £10 an hour, which is worked into my expenses for each kit.
